<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item
        @click.native="removePath"
        :to="{ path: '/home' }"
        replace
        >首页</el-breadcrumb-item
      >
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意:只允许第三级分类设置相关参数!"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>
            选择商品分类:
          </span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            :options="cateList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children'
            }"
            v-model="selectedCatekeys"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(item, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                ><el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column></el-table
          >
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          ><!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(item, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                ><el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column></el-table
          >
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        ref="addFormRef"
        :model="addForm"
        :rules="addFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
    >
      <el-form
        ref="editFormRef"
        :model="editForm"
        :rules="addFormRules"
        label-width="80px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类的数据
      cateList: [],
      //   级联选择框双向绑定的数组
      selectedCatekeys: [],
      //   被激活的页签的名称
      activeName: 'many',
      //   动态参数数据
      manyTableData: [],
      //   静态参数数据
      onlyTableData: [],
      //   控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //   控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //   将要添加的表单数据
      addForm: {
        attr_name: ''
      },
      //   将要修改的表单数据
      editForm: {
        attr_name: ''
      },
      //   添加数据表单的验证规则
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '参数不能为空',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    removePath() {
      window.sessionStorage.removeItem('activePath')
    },
    // 获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败!')
      }
      this.cateList = res.data
    },
    // 级联选择项发生变化时触发这个函数
    handleChange() {
      if (this.selectedCatekeys.length !== 3) {
        this.manyTableData = []
        this.onlyTableData = []
        return (this.selectedCatekeys = [])
      }
      this.getParamsData()
    },
    //   根据所选分类的id和当前所处的面板,获取对应的参数
    async getParamsData() {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败!')
      }
      //   把参数从字符串变为数组
      res.data.forEach(item => {
        // 如果参数为空,则返回一个空数组
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 监听修改对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('验证失败!')
        }
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败!')
        }
        this.$message.success('添加参数成功!')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮,显示修改对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击按钮,修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('验证失败!')
        }
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败!')
        }
        this.$message.success('修改参数成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 点击按钮,显示删除对话框
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数,是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          concelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败!')
      }
      this.$message.success('删除成功!')
      this.getParamsData()
    },
    // 文本框失去焦点或者按下Enter键时触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
      } else {
        row.attr_vals.push(row.inputValue.trim())
      }
      row.inputValue = ''
      row.inputVisible = false
      //   发起请求,保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('添加标签失败!')
      }
      this.$message.success('添加标签成功!')
    },
    showInput(row) {
      row.inputVisible = true
      /*   $nextTick方法的作用,是当页面上的元素重新渲染之后,
         才会调用回调函数中的代码,也就是button按钮变成文本框后才会调用*/
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除标签
    async handleClose(item, row) {
      row.attr_vals.splice(row.attr_vals.indexOf(item), 1)
      //   发起请求,保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除标签失败!')
      }
      this.$message.success('删除标签成功!')
    }
  },
  computed: {
    //   如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCatekeys.length !== 3) {
        return true
      }
      return false
    },
    cateId() {
      if (this.selectedCatekeys.length !== 3) {
        return null
      }
      return this.selectedCatekeys[2]
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态参数'
    }
  }
}
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 100px;
}
</style>
